morterud



E. MORTERUD.

CONDENSER.

APPLICATION FILED OCT- !5. 1913.

1,312,416. Patented Aug. 5,1919.

OFFICE.

amen onrnnmp, or ronnnnon, NEAR oss, nonwAY.

CONDENSER.

Specification of Letters Patent.

Patented Aug. 5, 1919.

Application filed October 15, 1918. Serial No. 258,270.

To all whom it may concern:

Be it known that I, EINAR MORTERUD, a subject of the King of Norway, of Torderod, near Moss, Norway, have invented certain new and useful Improvements in Condensers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference" being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

In condensers the velocity of the steam will decrease from intake to outlet owing to the condensation of steam, provided the cross section of the steam tube is the same. Accordingly the heat transmission co-eifi cient or the efficiency of the condenser will decrease from intake to outlet. In order to maintain a constant velocity of steam and thereby increase the capacity of the condenser, the condenser according to the present invention is supplied with a little more steam than it can condense in a single flow, and the steam which is not condensed at the outlet end of the condenser is conducted back again from this point by means of a fan or the like and is re-introduced in the condenser at one or more points nearer the outlet, where it again takes part in the condensing process. In this manner part of the steam introduced in the condenser will move in a cycle through the condenser from the inlet to the outlet and back again to one or more intermediate points, and at any interval of time there will flow more steam through the condenser than the steam condensed during the same interval. In this manner by a suitable arrangement of the circulating steam a comparatively even velocity of steam through the condenser may be obtained with the result that the whole of the heat transmission surface of the condenser is utilized in the best possible manner.

On the drawing is diagrammatically illustrated a form of the invention.

The drawing represents a longitudinal section through a counter current condenser, in which the steam is introduced at A and the condensed liquid let out at B, whereas the cooling medium is introduced at C and let out at D. At or near the outlet end of the condenser the steam tube E is provided with a branch F, through which steam is exhausted by means of a fan or the like G. From said fan G, the steam is conducted through backfiow conduit Hand therefrom through branches I, J, K, to the condensing tube E. i i

In the construction illustrated on the drawing .the condenser is divided in four parts longitudinally.

Of the quantity of steam introduced at A will be condensed during its passage through the first part of the condensing tube to the first branch I, and the velocity will at that point have decreased 25 per cent. Through the branch I is now introduced a quantity of steam equal to i of the quantity originally introduced, whereby the original velocity is again reestablished. Through the next part of tube E the velocity has again decreased and a new supply of steam is introduced. The same operation takes place from J to K and from K to F.

The quantity of steam which must be kept in circulation in the condenser in this case-- as will be seenis equal to a of the quantity introduced per time unit in the condenser.

It is obvious that the method above described is independent of the number of branches I, J, K, and theoretically the best result will be obtained by use of the largest possible number of branches, viz. a longitudinal slot for re-introducing the circulating steam.

For practical purposes it is, however, preferred to use a comparatively small number of branches in order to be able to easily control the quantity of steam in each branch.

Claims.

1. The method of condensing steam which consists in conducting part of the steam from the outlet end of the condenser back to one or more points between the inlet and outlet of the condenser with the object of maintaining as far as possible an even velocity of steam through the condenser, so as to increase the efliciency of the heat transmission.

2. In a condenser, a condensing tube, a back flow tube near the outlet end of the same, and means for sucking steam through the back-flow tube and conducting the same to one or more points nearer the intake end of the condensing tube.

3. The method of condensing steam which comprises maintaining a condensing flow by withdrawing a portion of the steam f m an advanced portion of the flow and introducing the withdrawn portion back into the How.

4. The method of condensing steam which comprises maintaining a condensing flow by withdrawing a portion of the steam from an advanced portion of the flow and introducing the withdrawn portion back into the flow near the begipning.

5. The method of condensing steam which comprises maintaining a condensing flow by withdrawing a portion of the steam from an advanced portion of the flow and introducing the withdrawn portion back into the flow at a plurality of points.

6. The method of condensing steam which comprises maintaining a condensing flow by withdrawing a portion of the steam from an advanced portion of the flow and introducing the withdrawn portion back into the flow at a plurality of successive points.

7; A condenser comprising a condensing tube, a back flow, tube, a plurality of passages connecting the tubes between the inlet and outlet ends of the condensing tube, and a suction device in the passage nearest the outlet for withdrawing steam from the condenser tube and introducing the same into the latter in front of the outlet.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

EINAR MORTERUD.

Witnesses:

M. W. KAHns, C. VARMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

